I don't post much, but every so often I come back to read any new postings on this case. I have been fascinated with it ever since I discovered it a few years ago. I think there are several things connected in this case: bloody prints that belonged to someone else in the house, car seen in the driveway that afternoon that witnesses were sure about before Joan went missing, that same car having been at the Risch home days earlier, Joan's husband out of town, woman fitting Joan's description seen walking down road with blood on her legs. I didn't initially think she had an abortion, but the signs do seem to point in that direction to some degree. But like others, I can't believe she would have an abortion when her daughter could walk into the house and her son could begin crying from his crib.
Joan went to the dentist that morning and according to one report I read needed additional dental work. So if she decided to disappear willingly she would have needed to see a dentist in the near future. Why not wait until all dental work was done so that wouldn't be a burden when you're trying to disappear.
I never thought she disappeared willingly because I can't imagine a mother leaving her two young children, not even kissing them goodbye, walking away to never see them again. However, it does happen. I found it interesting that the article states that the DA at the time said it was more likely she was alive than not. What an interesting (or irresponsible) thing to say unless there is some strong evidence not released to the public. Maybe they decided there were too many blood smears to be real? After thinking about the 25 books or so that Joan read about murders and disappearances, I wonder if she became obsessed and got caught up in the fantasy of disappearing and starting a new life. She had a traumatic childhood, having lost her parents in a fire and supposedly being raped. Maybe she read books to escape and it got out of control. There may have been some mental illness that hadn't really surfaced at the time. Perhaps the person who visited that day and had visited days earlier helped her escape. Having been in the publishing business, she probably knew a lot of people that loved books like her. Could she have found a book club and met someone who shared her hobby. Maybe she had planned to return shortly. Having young children is a tough job. Maybe she wanted to leave for a while and something went wrong or she got with the wrong crowd.
As for the blood, I keep reading that it wasn't much blood even though to us it looks like a lot. Maybe because it's dark in the pictures. Could the blood have been lightly splattered and yet it looks like a lot.
The other thing that I find a little strange is that Martin never remarried. You'd think after a while he would want to move on and find a mother figure for his young children. Unless he just didn't want to be married. I wonder if he had girlfriends. I also find it peculiar that he got to where he didn't want to discuss it with the media, unless he felt she left him and he was embarrassed, or perhaps he just got tired of discussing it over the years..
If it was an attack, I think it was either an intruder or the person whose car was in the driveway, something went wrong, maybe she fell to the floor, the perp thought she was dead or just freaked and ran, then decided to ride back by her house (perps like to revisit the crime scene) and saw her walking down the road, put her in his/her car and did away with her.